266 THE PROSPECT AND KENNY HILL SCHEMES, se 
for a double line; lead for joints, £800; trenching and laying, 
; carriage, at 30s. per ton, £2,838; giving a total of £19,409 
per - mile, or of £194, 090 for 10 miles. For the second secti on. of 6 
miles ——— valley of George’s River the thickness of depipel 
would lek increased to 1} inch, capable of bearing a safe head of 
412 feet, or a sdodani of 178-39 Ibs. per square inch, whilst it 
will only be actually exposed to a maximum pressure of 330 feet 
mile ; cost, at £6 15s. per ton, £7,823 5s. for a single line, or 
£15, 646 10s. yt double line of piping, which, with lead at £800, 
laying at £3,000, carriage at £3,476, gives a total of £22,922 10s. 
per mile, or of £1 37,535 for the whole section, For the 
tion of 16 miles to Sydney the —— of the pipes would be i 
inch capable of bearing a safe head of 375 feet, ora “er 
162°38 lbs. per square inch, whilst io maximum pressure it will 
be exposed to is a head 295 feet, or of 127-74 Ibs. per orale 
weight, 1,023 tons per mile ; cost, at £6 15s. per ton, £6, 905 5s. 
for a single line, and £13, 810 10s. for a double line of pipes, whi 
with lead at £800, laying at £3,000, and carriage at £2,558, givesa 
total of £20,168 10s. per mile, or of £322, 696 for the whole section. 
Besides the ‘above sums, at leas ms £500 per — 5 have to be 
added for air and ibn valves, gates, &., nting in all to 
£16,000, also £35,000 for acinianae £10, 000 for or purchas of land, 
and £4, 500 for clearing. The entire cost of the Kenny Hill 
scheme is estimated as follows :—Tunnels and conduit to service 
as per Mr. Moriarty’s estimate, but including a” 
additional sum for 5 miles of lining, £207,906; sent 
, £30,000 ? 
36-inch cast-iron pipes, £654,321; valves, gates, &e., : 
aqueducts, £35, 000 pa of land and clearing, £14,500 ; reservo™ 
at Petersham, £A, 800 ; reservoir at Waverley, — ars 
at Woollahra, £5, 000 ; compensation a 933,392. 
£10,000 ; survey and contingencies, £20,00' ital “21asest 
The ‘above safe-heads for the pipes are quoted from exposed 
tables, and ——— to Humber they can be constantly 
Durty or Kenny Hitt ScHEME. ie 
In an average season the service ees would be a a 
sustain the whole  s supply, whilst Le lie ; 
the pipes would be equal to the delivery a 23 
y to Crown-street, or 19 million gallons to P. ow. | 
million gallons to Woollahra, or 10-07 million gallons 
whilst their minimum duty during a very 
